MNMAN

Please try disabling all the add-ons and see if it makes and difference.

I did but the problem persist.

However the popup doesn't show a web address (C:\Users\TOSHIBA\AppData\Local\Microsoft\Windows\Temporary Internet Files\web.html) , I managed to get the web address related to this popup ( http://newbase.sytes.net), I hope this may help.

I have red about something called onewebsearch , it's a virus that takes over the browser.